Taste and odor compounds are organic chemicals produced via biochemical processes, and their presence, even at low nanogram-per-liter concentrations, can make water useless for drinking purposes. In this work, a very sensitive and completely automated analytical procedure, based on solid-phase microextraction, has been developed and optimized for determination of seven taste and odor compounds in water media, well below their odor threshold. The selected analytes were isopropyl-3-methoxypyrazine, 2-isobutyl-3-methoxypyrazine, geosmin, 2-methylisoborneol, 2,4,6-trichloroanisole, 2,4,6-bromoanisole, and beta-ionone. Compared with a conventional approach, the recently introduced PAL SPME Arrow showed a significant enhancement in sensitivity and also outstanding robustness and stability. Three commercially available fiber coatings, as well as experimental parameters of the headspace extraction procedure, such as extraction temperature, time, and ionic strength of the aqueous sample, were investigated to optimize the method. The linearity of the response was assessed over a three-orders-of-magnitude range, with R2 values higher than 0.9914. The method was satisfactorily precise, with RSDs less than 11% at the second lowest calibration point (10–26 ng L−1). The calculated LODs (S/N = 3) were below odor thresholds of the target analytes and varied between 0.05 and 0.6 ng L−1, for just 10 mL of water sample. An original and spiked river water sample was also analyzed, and relative recoveries of 75–116% were achieved. Based on these analytical performance characteristics, and compared with other published methods, the present method can be considered as the most sensitive wholly automated approach for determination of taste and odor compounds in water.
Gas chromatography-mass spectrometry Optimization Solid-phase microextraction arrow Taste and odor Water
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We thank Beat Schilling from BGB Analytik AG for providing the PAL SPME Arrow fibers.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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